Nikon MH-25a Battery Charger (Model 27148) User Manual

1. Introduction

This manual provides essential information for the safe and effective use of your Nikon MH-25a Battery Charger. The MH-25a is an original equipment manufacturer (OEM) charger designed specifically for recharging Nikon EN-EL15 Lithium-ion batteries. It is compatible with various Nikon camera models, including the Nikon D750 and D810.

Please read this manual thoroughly before using the charger and retain it for future reference.

2. Safety Information

To prevent injury, fire, or electric shock, always observe the following safety precautions:

Only use this charger with compatible Nikon EN-EL15 Lithium-ion batteries. Attempting to charge other battery types may cause damage or injury.
Do not expose the charger to rain, moisture, or extreme temperatures.
Do not disassemble or modify the charger. Refer all servicing to qualified personnel.
Keep the charger out of reach of children.
Ensure the power cord is not damaged and is properly connected to a suitable power outlet (100-240V AC).
Unplug the charger from the power outlet when not in use or during electrical storms.

3. Package Contents

Verify that all items are present in your package:

Nikon MH-25a Battery Charger
Power Cord (Accessory)

4. Setup

Connect the Power Cord: Insert the power cord into the charger's power input port.
Image: The Nikon MH-25a Battery Charger shown with its power cord connected, ready for use. The charger is black with the Nikon logo and model number MH-25a visible.
Plug into Power Outlet: Plug the other end of the power cord into a standard electrical outlet (100-240V AC).
Insert Battery: Align the Nikon EN-EL15 battery with the charging slot on the MH-25a charger and gently slide it in until it clicks into place. Ensure the battery contacts align with the charger's pins.

5. Operating Instructions

Once the battery is correctly inserted and the charger is plugged in, the charging process will begin automatically.

Charging Indicator: The "CHARGE" indicator light on the charger will illuminate to show that charging is in progress. The color and behavior of the light may vary (e.g., blinking red, solid red).
Charging Complete: When the battery is fully charged, the "END" indicator light will illuminate, or the "CHARGE" light will change color (e.g., to green) or turn off, depending on the charger's design.
Remove Battery: Once charging is complete, unplug the charger from the power outlet and then remove the battery by gently pressing the release tab (if present) and sliding the battery out.

Charging times can vary depending on the battery's remaining charge and its overall condition. For optimal battery life, avoid overcharging by removing the battery once fully charged.

6. Maintenance

Cleaning: Use a soft, dry cloth to clean the charger's exterior. Do not use liquid cleaners or solvents. Ensure the charging contacts are free of dust and debris.
Storage: Store the charger in a cool, dry place away from direct sunlight and extreme temperatures. When not in use, it is recommended to unplug the charger.
Battery Care: For best results, follow the battery manufacturer's guidelines for storage and usage of your EN-EL15 batteries.

7. Troubleshooting

Problem	Possible Cause	Solution
Charger indicator light does not illuminate.	Charger not plugged in. Power outlet is not active. Battery not inserted correctly. Battery is severely depleted or damaged.	Ensure the power cord is securely connected to the charger and the outlet. Test the outlet with another device. Re-insert the battery, ensuring proper alignment. Try charging a different, known-good battery. If the issue persists, the charger may be faulty.
Battery does not charge fully or takes too long.	Battery is old or degraded. Environmental temperature is too high or too low. Charger malfunction.	Consider replacing the battery. Charge the battery within recommended temperature ranges (typically 5°C to 35°C / 41°F to 95°F). Contact Nikon support if other batteries also charge slowly or incompletely.

8. Specifications

Model: MH-25a
Item Model Number: 27148
Brand: Nikon
Compatible Battery: Nikon EN-EL15 Lithium-ion
Input Voltage: 100-240V AC, 50/60Hz
Output Voltage: 8.4V DC, 1.2A
Product Dimensions: 7.2 x 2.95 x 4.06 inches
Item Weight: 10.2 ounces
Color: Black
Manufacturer: Nikon
Date First Available: June 26, 2014

9. Warranty and Support

For warranty information and technical support, please refer to the documentation included with your original purchase or visit the official Nikon website. You can also contact Nikon customer service directly for assistance with your MH-25a Battery Charger.

Nikon Official Website: www.nikonusa.com

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Nikon 27148